import {v4 as uuidv4} from 'uuid';
//要生成一个随机字符串,且每次执行不能发生变化,游客身份持久存储
export const getUUID = () => { 
    //先从本地存储获取uuid(看一下本地存储里面是否有)
    let uuid_token = localStorage.getItem('UUIDTOKEN');
    //如果没有
    if(!uuid_token){
        //生成游客临时身份
        uuid_token = uuidv4();
        //本地存储存储一次
        localStorage.setItem('UUIDTOKEN',uuid_token);
    }
    //我淦不要忘记return ....又漏了
    return uuid_token;
 }